PCIII USB Questions for Mr. Dynojet

[dan.adami]

Hi Mr. Dynojet, I own a 883R HDI Model and I just purchased a PCIII USB. I already asked for some help or a map for my specs, but I need to clarify some things, could you please help me out? (Any answer will be of great value for me, since I doesn't have anyone that could help me here in Brazil.)


1. Its obvious that, in advance mode, the fuel tables for the rear and front cylinders are different. Is this because of the temperature? Does the rear cylinder must be running richer than the front one?

2. Is there any difference between maps from the US and HDI models? (I'm asking that cause my gasoline is a bad quality one, 90 octanes alcohol 25%, and yours are 95 octane alcohol free I guess)

3. The Accelerator Pump feature, why is that necessary for? I read about some hesitation on the throttle response, but does it over-richens the engine once activated, making it stumble?

4. Why in some maps there are areas that the fuel is subtracted once you've installed a high flow air filter? Don't you have to add fuel because of the more air in the mixture and not remove?

Thanks for the help, if you please help me out with some answers or a map I would be very very grateful.

My specs:
2008 883R Model (HDI)
SE Heavy Breather Air Filter
Python 3 mufflers (slip-ons)
Stock ECM

Cheers,
Dan.

[DynojetResearch]

Originally Posted by dan.adami

Hi Mr. Dynojet, I own a 883R HDI Model and I just purchased a PCIII USB. I already asked for some help or a map for my specs, but I need to clarify some things, could you please help me out? (Any answer will be of great value for me, since I doesn't have anyone that could help me here in Brazil.)


1. Its obvious that, in advance mode, the fuel tables for the rear and front cylinders are different. Is this because of the temperature? Does the rear cylinder must be running richer than the front one?

Due to pipe design, airflow, etc., it is necessary to map each cylinder seperately. There are a number of areas that will be different in the fuel map. We target a certain AFR value rather than a cylinder head temperature. We are trying to make each cylinder run the same.


2. Is there any difference between maps from the US and HDI models? (I'm asking that cause my gasoline is a bad quality one, 90 octanes alcohol 25%, and yours are 95 octane alcohol free I guess)

We have used US developed maps on a number of European and Australian bikes. They seem to be quite close. The problem for your region is not the base map, it is the poor fuel quality. The high percentage of alcohol is going to require much richer fuel settings than other regions. There are people with our dynos in Brazil. You would really be best served to try and locate one near you to have the bike custom mapped.

3. The Accelerator Pump feature, why is that necessary for? I read about some hesitation on the throttle response, but does it over-richens the engine once activated, making it stumble?

Until the bike is correctly mapped I would leave the accel pump settings alone. It is only used if after the bike is mapped there is still a small issue when changing throttle settings quickly.

4. Why in some maps there are areas that the fuel is subtracted once you've installed a high flow air filter? Don't you have to add fuel because of the more air in the mixture and not remove?

You cannot assume that every change you make to the bike will increase airflow. Often, changing pipes, cams, etc., will reduce intake velocity and therefore cause an area to become richer than it was stock.
Thanks for the help, if you please help me out with some answers or a map I would be very very grateful.

My specs:
2008 883R Model (HDI)
SE Heavy Breather Air Filter
Python 3 mufflers (slip-ons)
Stock ECM

Cheers,
Dan.

Please see the above for details.

[dan.adami]

I'm very grateful for the answers Mr. Dynojet. There are a few drawbacks on dyno runs here in Brazil. The first and most important is that the nearest Dynojet dealer is 500 miles away, at São Paulo.

Curitiba H-D Dealer has one Dynojet Dyno, but they don't have any Dynojet certified tech for custom mapping using PCIIIusb, most of them heard about Power Commander, but they, in majority, never saw one installed on a Harley Davidson. Last saturday I was there (at H-D local dealer). Some techs were amazed with the PCIII.

Could you please help me out with a map? I'll use the push buttons on the panel to make the AF a little more rich then usual, trying to compensate the bad quality fuel we have.

Once again, thank you very much for the answers. This kind'a knowledge is rare around here.

Dan.

[DynojetResearch]

Give the attached map a try, just as it is. I richened up most of the map and added a little timing advance. See how it works for you.

[dan.adami]

Mr. Dynojet, I downloaded the map and uploaded on the PCIII.
Did a few runs, 20 miles on the highway, 10 miles at the city traffic.

The bike has too much "shake" once the throttle is wide open.
Feels like a rumble, shake (the best way to describe it..)

Sometimes, at low rpms its response is a little slow, to pick up some power, then it shakes a lot.

Is this a signal of a very rich map?

Thanks.

Dan.

[DynojetResearch]

Dan,
that map was a guess at best. Unfortunately in Brazil the fuel is going to be the problem. It really needs to be properly tuned.

Try running map M816-004 as a comparison. If it is better I will know which way to go.

[dan.adami]

Alright, thanks for helping me out.
I'll upload it to my PCIII and give you further feedback.

Once again, thanks.
Dan.